%0 Journal Article %A N. A. Sapogov %T Stability for the Marcinkiewicz theorem. Case of a fourth-degree polynomial %J Zapiski Nauchnykh Seminarov POMI %D 1976 %P 107-124 %V 61 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1976_61_a10/ %G ru %F ZNSL_1976_61_a10